A cabinetlike item usually with a front work area and consisting of the necessary instrumentation, integral hydraulic system and component mounting facilities. Designed to provide the hydraulic pressure for testing and/or calibrating hydraulic system components, such as valves, actuating cylinders, pressure regulators, accumulators, hose lines, hand and/or engine driven pumps and the like. May include facilities for filling and checking hydraulic systems for leakage and performance. See also PUMPING UNIT, HYDRAULIC.